Ultrafast quantum random access memory utilizing single Rydberg atoms in a Bose-Einstein condensate.

Area of Science:

• Quantum Information Science
• Atomic Physics
• Quantum Computing

Background:

• Quantum memory is essential for quantum computation and communication.
• Existing quantum memory solutions face limitations in speed, fidelity, or lifetime.
• Flux qubits offer fast operations but have short coherence times.

Purpose of the Study:

• To propose and demonstrate a novel quantum memory unit with enhanced performance.
• To enable rapid and high-fidelity transfer of quantum states between a flux qubit and an atomic ensemble.
• To facilitate a large number of quantum information storage and retrieval cycles.

Main Methods:

• Utilizing a Bose-Einstein condensate with two hyperfine levels and a single atom's Rydberg state for quantum memory.
• Employing a two-photon process with an external laser for qubit state transfer.
• Characterizing the fidelity and speed of quantum state transfer.

Main Results:

• Achieved ultrafast transfer of arbitrary qubit states in approximately 10 nanoseconds.
• Demonstrated a high fidelity of 97% for quantum state transfer.
• The proposed memory unit exhibits a long lifetime compatible with flux qubit operations.

Conclusions:

• The developed quantum memory unit offers a promising solution for efficient quantum information processing.
• Rapid transfer and high fidelity enable robust quantum state storage and retrieval.
• This approach significantly enhances the feasibility of scalable quantum computing architectures.